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Derivatives - Summary of Interest Rate Swap Transactions (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Derivatives Fair Value [Line Items]    
Swap assets $ 8,196 $ 12,481
Accrued Liabilities and Other Liabilities 8,196 12,481
Long [Member] | Interest Rate Swap [Member]    
Derivatives Fair Value [Line Items]    
Interest Rate Swaps With Loan Customers In An Asset Position Notional Amount 78,808 44,773
Fair Value Of Interest Rate Swaps With Loan Customers In An Asset Position 3,128 2,114
Short [Member] | Interest Rate Swap [Member]    
Derivatives Fair Value [Line Items]    
Interest Rate Swaps With Loan Customers In A Liability Position Notional Amount 148,863 184,100
Fair Value Of Interest Rate Swaps With Loan Customers In A Liability Position 8,196 12,481
Short [Member] | Financial Institutions [Member]    
Derivatives Fair Value [Line Items]    
Counterparty Positions With Financial Institutions In An Asset Position Notional Amount 227,671 228,873
Fair Value Of Counterparty Positions With Financial Institutions In An Asset Position $ 5,068 $ 10,367